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Fair Value Measurements - Changes in Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total assets measured at fair value | $ 61,245 |  | $ 17,821
Affiliated Mutual Funds And Variable Insurance Funds [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Equity securities | 8,013 |  | 8,980
Equity Securities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Equity securities | 4,379 |  | 3,546
Affiliated Closed End Funds [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Equity securities | 2,656 |  | 2,469
Sponsored closed-end funds | 2,656 |  | 2,469
Nonqualified Retirement Plan Assets [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Nonqualified retirement plan assets | 2,970 |  | 2,826
Investment Of Consolidated Sponsored Investment Products [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Equity securities | 43,227 |  |
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total assets measured at fair value | 28,110 |  | 17,821
Fair Value, Inputs, Level 1 [Member] | Affiliated Mutual Funds And Variable Insurance Funds [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Equity securities | 8,013 |  | 8,980
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Equity securities | 4,379 |  | 3,546
Fair Value, Inputs, Level 1 [Member] | Affiliated Closed End Funds [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Sponsored closed-end funds | 2,656 |  | 2,469
Fair Value, Inputs, Level 1 [Member] | Nonqualified Retirement Plan Assets [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Nonqualified retirement plan assets | 2,970 |  | 2,826
Fair Value, Inputs, Level 1 [Member] | Investment Of Consolidated Sponsored Investment Products [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Equity securities | 10,092 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total assets measured at fair value | 33,135 | [1] |
Fair Value, Inputs, Level 2 [Member] | Affiliated Mutual Funds And Variable Insurance Funds [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Equity securities |  | [1] |
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Equity securities |  | [1] |
Fair Value, Inputs, Level 2 [Member] | Affiliated Closed End Funds [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Sponsored closed-end funds |  | [1] |
Fair Value, Inputs, Level 2 [Member] | Nonqualified Retirement Plan Assets [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Nonqualified retirement plan assets |  | [1] |
Fair Value, Inputs, Level 2 [Member] | Investment Of Consolidated Sponsored Investment Products [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Equity securities | 33,135 | [1] |
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Total assets measured at fair value |  |  |
Fair Value, Inputs, Level 3 [Member] | Affiliated Mutual Funds And Variable Insurance Funds [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Equity securities |  |  |
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Equity securities |  |  |
Fair Value, Inputs, Level 3 [Member] | Affiliated Closed End Funds [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Sponsored closed-end funds |  |  |
Fair Value, Inputs, Level 3 [Member] | Nonqualified Retirement Plan Assets [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Nonqualified retirement plan assets |  |  |
Fair Value, Inputs, Level 3 [Member] | Investment Of Consolidated Sponsored Investment Products [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Equity securities |  |  |
[1] | Debt securities are valued based on evaluated quotations received from independent pricing services or from dealers who make markets in such securities. For most bond types, the pricing service utilizes matrix pricing which considers one or more of the following factors: yield or price of bonds of comparable quality, coupon, maturity, current cash flows, type and current day trade information, as well as dealer supplied prices. These valuations are categorized as Level 2 in the hierarchy.

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15E -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This element represents the fair value of assets categorized as other which are not in and of themselves material enough to require separate disclosure. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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